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Reconfigurable and adaptive photonic networks for high-performance computing systems.

Avinash Kodi1, Ahmed Louri

  • 1Department of Electrical Engineering and Computer Science, Ohio University, 322D Stocker Center, Athens, Ohio 45701, USA. kodi@ohio.edu

Applied Optics
|August 4, 2009
PubMed
Summary

Future high-performance computing (HPC) faces bandwidth issues with electrical interconnects. Optoelectronic interconnects with dynamic bandwidth reallocation (DBR) offer a flexible, adaptive solution, significantly boosting throughput and reducing latency.

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Area of Science:

  • Computer Engineering
  • Optoelectronics
  • High-Performance Computing

Background:

  • Electrical interconnects face bandwidth limitations in submicrometer, multigigahertz systems, creating imbalances in high-performance computing (HPC).
  • Decreasing feature sizes and increasing clock rates exacerbate bandwidth issues for longer communication distances.

Purpose of the Study:

  • To explore optoelectronic interconnects for flexible, high-bandwidth, reconfigurable, and adaptive interconnection architectures in HPC.
  • To evaluate the performance of a dynamic bandwidth reallocation (DBR) technique for balancing communication channel loads.

Main Methods:

  • Designed optoelectronic interconnects with reconfigurable optical transmitter arrays.
  • Implemented and evaluated the lockstep (LS) protocol for dynamic bandwidth reallocation (DBR).

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  • Utilized a discrete-event network simulator to assess performance across uniform, nonuniform, and permutation communication patterns.

    • Main Results:

    • Optoelectronic systems without reconfiguration outperform electrical interconnects for uniform and nonuniform patterns.
    • Dynamically reconfigurable optoelectronic interconnects show superior performance for all tested communication patterns.
    • Reconfigured architectures achieve 30%-50% increased throughput and 50%-75% reduced network latency compared to HPC electrical networks.

    Conclusions:

    • Dynamically reconfigurable optoelectronic interconnects are a viable solution for future HPC systems.
    • The lockstep (LS) protocol effectively manages bandwidth and adapts to changing communication patterns.
    • Optoelectronic interconnects offer significant performance improvements over traditional electrical interconnects for HPC.